Buggy code:
nöt . add ( dataHandler . findProducts ( "Grytbitar<seq2seq4repair_space>nöt" ) . get ( 0 ) ) ; nöt . add ( dataHandler . findProducts ( "Högrev" ) . get ( 0 ) ) ; nöt . add ( dataHandler . findProducts ( "Köttfärs<seq2seq4repair_space>nöt" ) . get ( 0 ) ) ; ArrayList < Product > kyckling = new ArrayList < > ( ) ; kyckling . add ( dataHandler . findProducts ( "Kycklingbröstfilé" ) . get ( 0 ) ) ; kyckling . add ( dataHandler . findProducts ( "Kycklingklubbor" ) . get ( 0 ) ) ; kyckling . add ( dataHandler . findProducts ( "Kyckling<seq2seq4repair_space>hel" ) . get ( 0 ) ) ; kött = new HashMap ( ) ; kött . put ( "Nöt" , nöt ) ; kött . put ( "Kyckling" , kyckling ) ; ArrayList < Product > fisk = new ArrayList < > ( ) ; fisk . add ( dataHandler . findProducts ( "Fiskpinnar" ) . get ( 0 ) ) ; fisk . add ( dataHandler . findProducts ( "Lax" ) . get ( 0 ) ) ; fisk . add ( dataHandler . findProducts ( "Sej" ) . get ( 0 ) ) ; fisk . add ( dataHandler . findProducts ( "Sill" ) . get ( 0 ) ) ; fisk . add ( dataHandler . findProducts ( "Tonfisk" ) . get ( 0 ) ) ; ArrayList < Product > skaldjur = new ArrayList < > ( ) ; skaldjur . add ( dataHandler . findProducts ( "Kräftor" ) . get ( 0 ) ) ; skaldjur . add ( dataHandler . findProducts ( "Räkor" ) . get ( 0 ) ) ; fiskSkaldjur = new HashMap ( ) ; fiskSkaldjur . put ( "Fisk" , fisk ) ; fiskSkaldjur . put ( "Skaldjur" , skaldjur ) ; ArrayList < Product > potatis = new ArrayList < > ( ) ; potatis . add ( dataHandler . findProducts ( "Potatis" ) . get ( 0 ) ) ; potatis . add ( dataHandler . findProducts ( "Potatis<seq2seq4repair_space>röd" ) . get ( 0 ) ) ; potatis . add ( dataHandler . findProducts ( "Potatis<seq2seq4repair_space>söt" ) . get ( 0 ) ) ; potatis . add ( dataHandler . findProducts ( "Potatispuré" ) . get ( 0 ) ) ; ArrayList < Product > övrigaRotfrukter = new ArrayList < > ( ) ; övrigaRotfrukter . add ( dataHandler . findProducts ( "Kålrot" ) . get ( 0 ) ) ; övrigaRotfrukter . add ( dataHandler . findProducts ( "Majrova" ) . get ( 0 ) ) ; övrigaRotfrukter . add ( dataHandler . findProducts ( "Morot" ) . get ( 0 ) ) ; övrigaRotfrukter . add ( dataHandler . findProducts ( "Palsternacka" ) . get ( 0 ) ) ; övrigaRotfrukter . add ( dataHandler . findProducts ( "Pepparrot" ) . get ( 0 ) ) ; övrigaRotfrukter . add ( dataHandler . findProducts ( "Rädisa" ) . get ( 0 ) ) ; övrigaRotfrukter . add ( dataHandler . findProducts ( "Rödbeta" ) . get ( 0 ) ) ; övrigaRotfrukter . add ( dataHandler . findProducts ( "Rotselleri" ) . get ( 0 ) ) ; rotfrukter = new HashMap ( ) ; rotfrukter . put ( "Potatis" , potatis ) ; rotfrukter . put ( "Övriga<seq2seq4repair_space>rotfrukter" , övrigaRotfrukter ) ; ArrayList < Product > ost = new ArrayList < > ( ) ; ost . add ( dataHandler . findProducts ( "Brie" ) . get ( 0 ) ) ; ost . add ( dataHandler . findProducts ( "Färskost" ) . get ( 0 ) ) ; ost . add ( dataHandler . findProducts ( "Mozzarella" ) . get ( 0 ) ) ; ost . add ( dataHandler . findProducts ( "Västerbotten" ) . get ( 0 ) ) ; ArrayList < Product > mjölk = new ArrayList < > ( ) ; <START_BUG> mjölk . add ( dataHandler . findProducts ( "Mjölk" ) . get ( 0 ) ) ; <END_BUG> ArrayList < Product > yoghurtFil = new ArrayList < > ( ) ; yoghurtFil . add ( dataHandler . findProducts ( "Filmjölk" ) . get ( 0 ) ) ; yoghurtFil . add ( dataHandler . findProducts ( "Yoghurt<seq2seq4repair_space>laktosfri" ) . get ( 0 ) ) ; yoghurtFil . add ( dataHandler . findProducts ( "Yoghurt<seq2seq4repair_space>turkisk" ) . get ( 0 ) ) ; ArrayList < Product > glass = new ArrayList < > ( ) ; glass . add ( dataHandler . findProducts ( "Glass" ) . get ( 0 ) ) ; ArrayList < Product > ägg = new ArrayList < > ( ) ; ägg . add ( dataHandler . findProducts ( "Ägg" ) . get ( 0 ) ) ; mejeri = new HashMap ( ) ; mejeri . put ( "Ost" , ost ) ; mejeri . put ( "Mjölk" , mjölk ) ; mejeri . put ( "Yoghurt<seq2seq4repair_space>och<seq2seq4repair_space>fil" , yoghurtFil ) ; mejeri . put ( "Glass" , glass ) ; mejeri . put ( "Ägg" , ägg ) ; ArrayList < Product > pasta = new ArrayList < > ( ) ; pasta . add ( dataHandler . findProducts ( "Farfalle" ) . get ( 0 ) ) ; pasta . add ( dataHandler . findProducts ( "Fettuccine" ) . get ( 0 ) ) ; pasta . add ( dataHandler . findProducts ( "Fusilli" ) . get ( 0 ) ) ; pasta . add ( dataHandler . findProducts ( "Lasagne" ) . get ( 0 ) ) ; pasta . add ( dataHandler . findProducts ( "Penne" ) . get ( 0 ) ) ; pasta . add ( dataHandler . findProducts ( "Rigatoni" ) . get ( 0 ) ) ; pasta . add ( dataHandler . findProducts ( "Spaghetti" ) . get ( 0 ) ) ; ArrayList < Product > ris = new ArrayList < > ( ) ;

Fix:
mjölk . add ( dataHandler . findProducts ( "Mjölk" ) . get ( 1 ) ) ;